pyranose ring

pyranose ring

a monosaccharide with a six-membered ring structure.
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Basically, ceric ion, a strong oxidizing agent, could oxidize pyranose ring of starch to produce free starch macro-radical ([Ce.
1]) and the skeletal vibration of pyranose ring (935, 851, 761, 579, and 536 [cm.
2%, attributing to the pyranose ring structure in the common carbohydrate compound.
This clearly indicates the slight distortion of the pyranose ring from regular [sup.
3B) is assigned to the first overtone of the fundamental CH stretching vibrational mode and is due to the furanose or pyranose ring (invariable constituent of hemicellulose).
This is also clear from the variation in the peak position of the infrared band markers at 1580 nm (crystalline region in cellulose), 1705 nm (aromatic skeletal in ligin) and 1773 (furanose or pyranose ring constituent of hemicellulose) at different temperatures.
From the first come seven papers exploring conformational dynamics of oligosaccharides, structure and dynamics of carbohydrates using residual dipolar couplings, combined theoretical and NMR (nuclear magnetic resonance) experimental approach on carbohydrate-aromatic interactions and on pyranose ring distortion, laser photo chemically induced dynamic nuclear polarization technique as a tool for structural analysis of inter- and intramolecular protein-carbohydrate interactions, and hydroxy protons in structural studies of carbohydrates by NMR spectroscopy.
Electronegative substituents at the C-2 position of saturated heterocycles or at the anomeric carbon of a pyranose ring favor the equatorial position much less than expected; often the axial position is favored.
84 ppm were assigned to the pyranose ring protons of carbon-3 of the [beta] anomer.
In addition, chitosan has reactive amino groups on pyranose rings and becomes a cationic polymer upon the protonation of its amino groups.
Both chitosans had peaks based on pyranose rings and acetyl amino groups.